i think its not that its never been done ie:headlight cover,lower light covers, and lug nuts.its just not many people have exucuted it so nicely like yourself.and now its been shown to the masses as of late due to the chp!!! i bet it even brought some more interest in the vintage trans am racing.
as for the covers you could always just use colored duct tape in an "X"

soon your car wont be so original since your letting out all you secrets